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Returns the subject (subject distinguished name) as an implementation specific Principal object.
The ASN.1 definition of subject:
java Example
 subject      Name
  Name ::= CHOICE {
      RDNSequence }
    RDNSequence ::= SEQUENCE OF RelativeDistinguishedName
    RelativeDistinguishedName ::= SET OF AttributeTypeAndValue
    AttributeTypeAndValue ::= SEQUENCE {
      type     AttributeType,
      value    AttributeValue }
    AttributeType ::= OBJECT IDENTIFIER
    AttributeValue ::= ANY DEFINED BY AttributeType